Signal processing of multiple streams

Abstract

Embodiments of methods, apparatuses, and systems for signal processing of multiple input signals to control peak amplitudes of a combined signal are disclosed. One method includes receiving a plurality of input signals, generating a combined signal, the combined signal comprising a plurality of sub-channels, wherein each sub-channel includes a representation of at least a portion of at least one of the plurality of input signals, and processing the representation of the least a portion of the at least one of the plurality of input signals of at least one of the sub-channels, to reduce a peak-to-average-power ratio (PAR) of the combined signal.

What is claimed is: 
     
       1. A method of processing input signals, comprising; receiving a plurality of input signals, at least one of the received plurality of input signals including a plurality of replicated sub-channels; generating a combined signal, the combined signal comprising the plurality of replicated sub-channels; processing the plurality of input signals to generate an output signal that includes the plurality of replicated sub-channels, to reduce a peak-to-average-power-ratio (PAR) of the combined signal; generating a peak-reduction signal; and adding the peak-reduction signal with the combined signal, thereby reducing the PAR of the combined signal. 
     
     
       2. The method  claim 1 , wherein the processing comprises applying a different delay to each of the sub-channels. 
     
     
       3. The method of  claim 2 , further comprising selecting each of the different delays to mitigate the peak-to-average-power-ratio (PAR) of the combined signal. 
     
     
       4. The method of  claim 2 , wherein each of the different delays of each of the sub-channels is applied before generating the combined signal. 
     
     
       5. The method of  claim 2 , wherein each of the different delays of each of the sub-channels is applied after generating the combined signal. 
     
     
       6. The method of  claim 5 , wherein the different delays of each of the subchannels are applied by selective filtering of the combined signal. 
     
     
       7. The method of  claim 1 , wherein each sub-channel occupies a different frequency band, and further comprising; re-aligning a center frequency of at least one sub-channel. 
     
     
       8. The method of  claim 7 , wherein the re-alignment of the center frequency of the at least one sub-channel is adaptive based on at least one of a PAR measurement, or a sub-channel frequency plan. 
     
     
       9. The method of  claim 7 , wherein the re-alignment of the center frequency of the at least one sub-channel is random or deterministic. 
     
     
       10. The method of  claim 7 , further comprising independently or jointly realigning the at least one sub-channel to reduce the PAR. 
     
     
       11. The method of  claim 1 , further comprising scaling at least one of the subchannels differently than at least one other sub-channel. 
     
     
       12. The method of  claim 11 , wherein scaling comprises an inversion. 
     
     
       13. The method of  claim 1 , further comprising generating the peak reduction signal from the plurality of input signals. 
     
     
       14. The method of  claim 1 , wherein the processing the plurality of input signals adaptively changes based on a number of sub-channels of the combined signal. 
     
     
       15. The method of  claim 1 , wherein the processing the plurality of input signals adaptively changes based on a statistical correlation of the input signals. 
     
     
       16. The method of  claim 1 , wherein the processing the plurality of input signals adaptively changes based on desired PAR characteristics of the combined signal. 
     
     
       17. The method of  claim 1 , wherein the processing the plurality of input signals adaptively changes, wherein a rate of the changes is based at least in part upon characteristics of a receiver of a signal that is based on the combined signal. 
     
     
       18. An apparatus for processing input signals, comprising; a multi-stream processing system configured to receive a plurality of input signals and generate a combined signal, wherein the combined signal includes a plurality of replicated sub-channels, wherein each replicated sub-channel includes a representation of at least a portion of at least one of the plurality of input signals; signal processing circuitry configured to process the representation of the least a portion of the at least one of the plurality of input signals of at least one of the subchannels to reduce a peak-to-average-power ratio (PAR) of the combined signal, generate a peak-reduction signal and add the peak-reduction signal with the combined signal, thereby reducing the PAR of the combined signal. 
     
     
       19. The apparatus of  claim 18 , wherein the signal processing circuitry applies a different delay to each of the sub-channels. 
     
     
       20. The apparatus of  claim 19 , further comprising selecting each of the different delays to mitigate the peak-to-average-power-ratio (PAR) of the combined signal. 
     
     
       21. The apparatus of  claim 19 , wherein each of the different delays of each of the sub-channels is applied before generating the combined signal. 
     
     
       22. The apparatus of  claim 19 , wherein each of the different delays of each of the sub-channels is applied after generating the combined signal. 
     
     
       23. The apparatus of  claim 22 , wherein the different delays of each of the subchannels are applied by selective filtering of the combined signal. 
     
     
       24. The apparatus of  claim 18 , wherein each sub-channel occupies a different frequency band, and further comprising; re-aligning a center frequency of at least one sub-channel. 
     
     
       25. The apparatus of  claim 24 , wherein the re-alignment of each of sub-channel is adaptive based on at least one of a PAR measurement, or a sub-channel frequency plan. 
     
     
       26. The apparatus of  claim 24 , wherein the re-alignment of each of the plurality sub-channels is random or deterministic. 
     
     
       27. The apparatus of  claim 18 , further comprising; the processing circuitry inverting at least one of the plurality of sub-channels. 
     
     
       28. The apparatus of  claim 18 , further comprising the processing circuitry configured to generate the peak reduction signal from the plurality of sub-channels. 
     
     
       29. The apparatus of  claim 18 , wherein the processing the representation of the least a portion of the at least one of the plurality of input signals of at least one of the sub-channels adaptively changes based on a number of sub-channels of the combined signal. 
     
     
       30. The apparatus of  claim 18 , wherein the processing the representation of the least a portion of the at least one of the plurality of input signals of at least one of the sub-channels adaptively changes based on desired PAR characteristics of the combined signal. 
     
     
       31. The apparatus of  claim 18 , wherein the processing the representation of the least a portion of the at least one of the plurality of input signals of at least one of the sub-channels adaptively changes, wherein a rate of the changes is based at least in part upon characteristics of a receiver of a signal that is based on the combined signal. 
     
     
       32. A method of processing input signals, comprising; receiving a plurality of input signals; generating a combined signal, the combined signal comprising a plurality of replicated sub-channels, wherein each sub-channel includes a representation of at least a portion of at least one of the plurality of input signals; processing the combined signal to reduce a peak-to-average-power ratio (PAR) of the combined signal; generating a peak-reduction signal; and adding the peak-reduction signal with the combined signal, thereby reducing the PAR of the combined signal.